package org.apache.lucene.analysis;

/**
 * Copyright 2004-2005 The Apache Software Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.io.IOException;
import java.io.Reader;

/**
 * Emits the entire input as a single token.
 */
public class KeywordTokenizer extends Tokenizer {

    private static final int DEFAULT_BUFFER_SIZE = 256;

    private boolean done;
    private final char[] buffer;

    public KeywordTokenizer(Reader input) {
        this(input, DEFAULT_BUFFER_SIZE);
    }

    public KeywordTokenizer(Reader input, int bufferSize) {
        super(input);
        this.buffer = new char[bufferSize];
        this.done = false;
    }

    public Token next() throws IOException {
        if (!done) {
            done = true;
            StringBuffer buffer = new StringBuffer();
            int length;
            while (true) {
                length = input.read(this.buffer);
                if (length == -1)
                    break;

                buffer.append(this.buffer, 0, length);
            }
            String text = buffer.toString();
            return new Token(text, 0, text.length());
        }
        return null;
    }
}
